Corona rings for high voltage station, Definition of HV surge arresters

Surge arresters are used to protect high-voltage equipment in substations, such as transformers, circuit breakers, and bushings, against the effects of overvoltages caused by incoming surges. Such overvoltages can be caused by a direct or nearby lightning strike, an electromagnetic pulse, electrostatic discharge, or switching operations in the power supply system as well as in devices. Some overvoltages are very high in energy. The current from the surge is diverted through the arrester, in most cases to earth. Effective overvoltage protection requires different surge arrester types to be used according to the particular application.

Overview of our high voltage station arresters

Our portfolio consists of three types of surge arresters for specific applications:

3EL product family – Surge arresters with directly molded silicone rubber housing, Cage Design
3EQ product family – Surge arresters with silicone housing, composite hollow core design
3EP product family – Surge arresters with porcelain housing

Main features:

  • High mechanical stability for support applications and for use in regions with high seismic activity
  • Extremely reliable pressure relief for use in areas requiring special protection
  • Excellent pollution layer characteristics for use in coastal and desert regions or in areas with extreme air pollution
  • All three surge arrester product families feature a superior sealing system that reliably prevents moisture ingress
  • Decades of trouble-free service
  • Manufactured using only environmentally compatible materials

Siemens surge arresters for any requirement Experience is most essential when it comes to reliability in medium- and high-voltage applications. Siemens has been designing and manufacturing medium- and high-voltage surge arresters for standard and special applications since 1925. Continuous research and development, the wealth of Siemens know-how, and comprehensive worldwide experience give Siemens surge arresters a leading edge in overvoltage protection. Their uncompromising quality ensures a long service life and reliability in any application. Siemens surge arresters are an indispensable aid to insulation coordination in electrical power supply systems. Valuable equipment such as transformers, circuit breakers, generators, motors, capacitors, traction vehicles, and bushings, as well as complete switchgear, is ideally protected against lightning and switching overvoltages. Siemens surge arresters have been designed to meet the requirements of a wide range of common installation environments, from arctic cold to the heat of the desert and the humidity of tropical climates. They are available for any application from 3 kV up to 1,200 kV including special applications such as high-voltage direct current (HVDC) and FACTS systems as well as all kinds of compensation systems for electric power networks

Always the best solution Developments in technology and practical experience have led to three different surge arrester designs: • Surge arresters with porcelain housings • Surge arresters with silicone housings • Surge arresters with metal enclosures Siemens provides each of these types in several versions, making it possible to find the optimal surge arrester for every conceivable application and meet even specific demands, such as • High mechanical stability for outstanding seismic safety • Extremely reliable pressure relief behavior for use in areas requiring special protection • Excellent pollution layer characteristics for use in coastal and desert regions or in areas with extreme air pollution. All Siemens surge arresters feature a superior sealing system that reliably prevents moisture ingress to ensure the highest possible degree of overvoltage protection and decades of trouble-free service. Moreover, the choice of materials used in the making of Siemens surge arresters contributes to the protection of the environment.

Station and intermediate class surge arresters Siemens provides three surge arrester product families for standard and special AC applications from 3 kV up to 800 kV, which are described in this brochure: • 3EL surge arresters with silicone housing, Cage Design™ • 3EQ surge arresters with silicone housing, composite hollow core design • 3EP surge arresters with porcelain housing

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